Strainer



K. M FARLIN Oct. 23, 1951 STRAINER 2 SHEETS'SHEET 1 Filed Dec. 19, 1946EU DEED DDUDUUD FIG. 2'

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K M FARLIN STRAINER 2 SHEETS-SHEET 2 Filed Dec. 19, 1946 FIG. 5

FIG. 7

INVENTOR Kirk Mc Forlin BY [A ATTORN EY Patented Oct. 23, 1951 UNITEDSTATES PATENT OFFICE 7 Claims.

This invention relates to improvements in strainers, and moreparticularly to strainers for water pumps adapted to prevent sticks andother foreign bodies from entering the inlets of pumps and impairing theoperation thereof.

An important object of the invention is to provide an efficient strainerfor a water pump, of simple and inexpensive construction, with areticulated wall through which the water flows on its way to the intakepipe of the pump, and having special structural features by whichforeign bodies are arrested on the exterior of the strainer, andclogging of the openings to the interior is averted.

Another object of the invention is to provide a. strainer of the typementioned designed for ready and quick assembly to make a finisheddurable unit capable of long and satisfactory service.

These and additional objects and advantages of the invention are fullydescribed herein and the novel features of my improved strainer aredefined in the appended claims. But this disclosure is explanatory only,and I do not wish to be limited to the exact form illustrated and setforth. In practice many changes in details may be adopted withoutdiscarding any of the essential characteristics of the device.

In the drawings:

Figure 1 is a top plan view of my improved container.

Figure 2 is a horizontal cross-sectional view of same.

Figures 3 and 4 present details thereof.

Figure 5 is a top view of a modification. Figure 6 is a side view; and

Figure 7 is ,a cross section thereof.

The strainer is illustrated as comprising a body with a bottom 2 and atop 3. In generalthe shape is cylindrical or round, though of course itcan be produced in other forms without material alteration in eitherdesign or operation. Between the ends 2 and 3 the body is reticular,with openings 4 that are square or of any other desired outline. The top3 has a central opening 5 by which the strainer can be coupled to theinat the inner end; and bears internal screw threads 9. This shapefacilitates the connection of, the pump conduit with the strainer,because the conduit, which is of somewhat less outside thickness thanthe inside diameter of the neck 6 can be easily inserted into the latterand then guided by the contracting inside surface of the neck 6 intoengagement with the threads 9 to make a tight union therewith. The neck6 is surrounded by a baffie member Ill, which is concentric withthe neckand extends beyond the inner end thereof to a point which is apredetermined distance from the bottom 2. This sleeve I0 is also securedby welding or in any other suitable way to the inside face of the top 3.The water enters by way of the openings 4 and flows past the edge of thesleeve 16, and is drawn out through the neck 6.

The shoulder I enables the top 3 to be quickly and eifectively affixedto the neck, and then the baffle sleeve I0 can be readily put into placearound the neck and secured to the top 3. The top with the neck andsleeve can then easily be united as by welding to the body I and thebottom 2 is then afiixed to the body in the same way, or theparts can.be assembled in any other order that is convenient.

The bottom 2 projects beyond the body, as shown at ll, around its entireperiphery, and the top 3 also projects in the same manner as shown atl2. The extension of the edges of the bottom keeps twigs, sticks andother objects from being drawn into direct contact with the strainerbetween the top and bottom to such a degree as to clog the openings 4and obstruct the flow of water therethrough. A large stick, for example,is apt to be engaged by both edges, or even if it is impelled againstone edge only and strikes against the reticulated body at one end, thesame effect will still be obtained, though somewhat reduced, because forthe greater part of the length of the stick or twig a material spacewill be left between it and the outside of the strainer. If a number oftwigs are collected in this way at the strainer, they will form at mosta mass with numerous interstices and passages through it, and the flowof water will not be materially diminished. Without the extended edgesII and I2, the refuse in the water could come into direct contact withthe body, and before long the strainer would become so choked thatoperation could not be continued without stopping the pump and removingthe aggregated material. The effect due to the edges II and I2 is quitemarked, and the advantage and benefit which these edges give in practicehave been demonstrated over long periods of actual service under allconditions which are encountered with pumps.

The shoulder joint between the end 3 and the neck 6 is tight andleak-proof and the general design, including the shape and method ofassembling the various parts, imparts to the device great strength anddurability, enabling it to withstand rough treatment under severeconditions of use.

In Figures 5, 6 and 7 the construction is very similar except that theends 2 and 3' are cut away at one part of the rim to provide straightedges l3. The reticulated body 4 terminates adjacent the ends of thesestraight edges and between the opposite ends of said member 4 the ends 2and 3' are joined by a fiat plate I4 also secured in place by weldingand having a central opening 5' for the neck 6. The neck has the sameshape as before projecting inside of the strainer and connected to theedges of the aperture 5 by the same kind of shouldered joint. Thismodification also includes a baffle plate l which is welded to the topplate or end 3' as before and terminates short of the opposite end 2.This plate is curved, away from the neck 6 over the greater part of itsextent and its two ends are bent towards the plate l4 and welded theretoalong the edges.

This form of strainer is, of course, connected to the suction pipeleading to the pump at the side where the opening and neck 9 arelocated.

At the center the ends 2' and 3' may be joined by a tube 16 openthroughout and having its ends secured by welding to the end plates 2'and 3'. This tube adds to the strength of the construction and to someextent facilitates handling.

For example, a rope or cord might be passed through this tube l6 afterthe pump pipe has been joined to the neck 6, if the pipe and thestrainer have to be lowered or moved about after immersing into the poolto be drained.

From the foregoing description, the nature of my invention is now clear,and the construction set forth is well calculated to afford all of theadvantages and objects which should be obtained with a strainer of thistype.

Having described my invention, what I believe to be new is:

l. A strainer comprising end plates and a body with a reticulated walljoined to said end plates along its opposite edges, said end platesbeing extended beyond said wall to obstruct contact of floating bodiestherewith, one of said end plates having an outlet opening, a neckafiixed to the last-named plate at the inner edge of said opening and abalile element attached to the inner face of said last-named end platesurrounding said opening and said neck, and terminating short of theother end plate.

2. A strainer comprising end plates and a body having a reticulated walljoined to said end plates along its opposite edges, one of said endplates having an outlet opening, a coupling neck with an externalshoulder engaged by the lastnamed plate at the inner edge of the openingand secured thereto, said neck having a contracting inner surface withinside threads for con venient engagement with an intake conduit for apump, and a baflle element affixed to the inside face of said last-namedend plate concentric with the neck and extending beyond the inner endthereof and terminating short of the opposite end plate.

3. A strainer having a body with a reticulated wall and end platesjoined to the wall along its opposite edges, said end plates beingextended beyond the outer face of the wall to obstruct contact offloating bodies therewith, one of said end plates having an outletopening, a coupling neck inside said strainer, said neck having anexternal shoulder which fits into the last-named plate at said outletopening and is secured thereto, a baflie sleeve affixed to the insideface of said last-named end plate and concentric with said neck, saidelement extending inward beyond the neck and terminating short of theopposite end plate, the neck having a contracting inner surface andinside threads for convenient coupling to the intake of a water pump.

4. A strainer comprising end plates and a body with a reticulated walljoined to said end plates along its opposite edges, said ends beingextended beyond said wall to obstruct contact with fioating bodiestherewith, the strainer having an outlet opening, a neck aflixed to thebody at the inner edge of said opening and a baffle element attached tothe inner face of one of said end plates adjacent said neck andterminating short of the other end plate.

5. A strainer comprising end plates and a body with a reticulated wallconnecting said end plates along its opposite edges, said end platesbeing extended beyond said wall, the reticulated wall having separatedends, a plate joined to said separated end plates and to the ends of thebody, said plate having an opening, a neck attached to the edge of theopening and projecting into the strainer and a bafiie element attachedto the inner face of one of the end plates of the strainer in front ofsaid neck, the ends of said element being bent towards said plate andsecured thereto.

6. A strainer according to claim 5 wherein said neck contracts withinsaid strainer and has inside threads on said contracting surface.

7. A strainer comprising end plates and a body with a reticulated walljoined to said end plates along its opposite edges, the strainer havingan outlet opening, a bafiie plate attached to the inner face of one ofsaid end plates adjacent said opening and terminating short of the otherend plate, and a neck attached to the firstnamed plate at the inner edgeof said opening and extending into the body, said neck contractingtowards the inner end and bearing internal threads adjacent thenarrowest part thereof.

KIRK MCFARLIN.

REFERENCES CITED The following references are of record in the file ofthis patent: I

UNITED STATES PATENTS Number Name Date 228,986 Crocker June 22, 18801,326,385 Bartlett Dec. 30, 1919 1,694,743 Hinman Dec. 11, 19281,722,626 Dean July 30, 1929 1,836,269 McKenzie Dec. 15, 1931 1,945,824Saxe Feb. 6, 1934 2,100,165 Holmiberg et al. Nov. 23, 193'? FOREIGNPATENTS Number Country Date 289,643 Germany Jan. 12, 1906

